You receive this error when compiling your application:
Error BC31011: Unable to load referenced library. Version 2.0 is not a compatible version.
This error occurs when two or more Infragistics releases (versions) have been used, or mixed, within your application.
See The server tag XXX is ambiguous. Please modify the associated registration... for details.
Part VII: Troubleshooting Applications
Application Generation and Compilation Error Messages